The Effect of Formulation Diets Based on Digestible Amino Acids and Lysine Levels on Carcass and Chemical Composition of Broiler
محورهای موضوعی : Camel
1 - Department of Animal Science, Saveh Branch, Islamic Azad University, Saveh, Iran
2 - Department of Animal Science, Shahrekord Branch, Islamic Azad University, Shahrekord, Iran
کلید واژه: Broiler, carcass, Lysine, Arian, digestible,
چکیده مقاله :
This study was conducted to evaluate the carcass yield, abdominal fat deposition and chemical compositions of thigh and breast muscles of male Arian broilers fed three different lysine levels of 1) high lysine (110% NRC), 2) standard level suggested by National Research Council (NRC) and 3) low lysine (90% NRC) based on two expression ways of amino acid contents of feedstuffs, as total amino acids (TAA) or digestible amino acids (DAA). Three hundred one day old male broiler chickens were used in a completely randomized design with 6 treatments of 5 replicates (10 male broilers). All diets were iso-caloric and iso-nitrogenous. The results of this study showed that diet formulation based on DAA significantly influenced breast muscle yieldand abdominal fat deposition. High lysine level (110% NRC) significantly improved carcass yield, breast and thigh muscle percentages and weights. The interaction between DAA × lysine levels of the feed affects carcass and breast muscle percentages of the broilers. Feeding the broilers with high level lysine containing diets (110% NRC) resulted in significantly high lysine content of the breast and thighmuscles. The results of this study suggest that diet formulation based on digestible amino acids with additional lysine at the level of 110% of NRC in starter and grower diets optimized body weight gain in Arain male broilers.
به منظور تعیین اثرات سطوح مختلف احتیاجات اسیدآمینه لیزین در دو نوع جیره نویسی بر اساس اسیدآمینه کل و قابل هضم خوراک بر ترکیب شیمیایی و خصوصیات لاشه جوجه‌های گوشتی، از تعداد 300 قطعه جوجه گوشتی نر سویه آرین و در مجموع 6 تیمار آزمایشی با 5 تکرار در قالب طرح کاملاً تصادفی و به روش آزمایش فاکتوریل 3 × 2 استفاده شد. در این آزمایش، فاکتور اول، شامل 2 سطح اسیدآمینه کل و قابل هضم خوراک مصرفی و فاکتور دوم، سه سطح، اسیدآمینه لیزین کل (90 ، 100 و 110 درصد) مورد احتیاجات جوجه‌های گوشتی می‌باشد، جیره‌های آزمایش از لحاظ میزان انرژی و پروتین یکسان بودند. نتایج این آزمایش نشان میدهد که جیره نویسی بر اساس اسیدآمینه قابل هضم خوراک روی وزن نسبی سینه و وزن چربی محوطه شکمی اثرات معنیداری گذاشته (05/0>P)، و جوجه‌های گوشتی مصرف کننده جیره‌های تنظیم شده براساس اسیدآمینه قابل هضم نسبت به اسیدآمینه کل خوراک دارای وزن نسبی سینه بیشتری دارند اثرات مثبت معنی‌دار در جوجه‌های مصرف‌کننده جیره‌های تنظیم شده بر اساس 110 درصد احتیاجات اسیدآمینه لیزین روی درصد لیزین گوشت ران و سینه مشاهده شد (05/0>P). این تحقیق نشان داد که افزایش سطح احتیاجات اسیدآمینه لیزین به110درصد توصیه انجمن ملی تحقیقات (1994) و جیره نویسی بر اساس اسیدآمینه قابل هضم خوراک باعث بهبود رشد جوجه‌های گوشتی در دوران آغازین و رشد شده است.
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